JP7784497B2 - Illumination module and lighting device including the same - Google Patents

Description

The present disclosure relates to a lighting module having a plurality of light sources and a lighting device having the same. The present disclosure relates to a lighting module that provides a line-shaped surface light source. The present disclosure relates to a lighting device, a light unit, a liquid crystal display device, or a vehicle lamp having the lighting module.

Lighting includes not only vehicle lighting but also backlights for displays and signs. Light-emitting diodes (LEDs) have advantages over existing light sources such as fluorescent lamps and incandescent lamps, such as low power consumption, a semi-permanent lifespan, fast response speed, safety, and environmental friendliness. Such light-emitting devices are applied to various display devices and various lighting devices such as interior and exterior lights. Recently, lamps using light-emitting devices such as light-emitting diodes as vehicle light sources have been proposed. Light-emitting devices have the advantage of lower power consumption compared to incandescent lamps. However, since the emission angle of light emitted from light-emitting devices is small, there is a demand for an increase in the light-emitting area of lamps using light-emitting devices when using light-emitting devices as vehicle lamps. Light-emitting devices are,
The small size allows for greater freedom in lamp design, and the semi-permanent lifespan makes it economical.

The present disclosure provides a lighting module that emits light from a plurality of light-emitting elements as a line-shaped light source or a surface light source in one direction, and a lighting device having the same.
The present disclosure provides a lighting device in which a resin layer is disposed between a substrate and a reflective layer, and light is emitted in a direction toward one side of the resin layer. The present disclosure provides a lighting device in which a resin layer having a light emitting element is disposed between a plurality of reflective layers. The present disclosure provides a lighting device in which a light extraction layer is disposed on an exit surface of the resin layer having a light emitting element between a plurality of reflective layers. The present disclosure provides a light unit having a lighting module,
A liquid crystal display device and a vehicle lamp can be provided.

The lighting device according to the present disclosure includes a substrate, a plurality of light-emitting elements arranged on the substrate, a first reflective layer arranged on the substrate, a resin layer arranged on the first reflective layer and including a first surface through which light emitted from the plurality of light-emitting elements is extracted, a second reflective layer arranged on the resin layer, and a light extraction layer arranged on the first surface of the resin layer, wherein the first surface of the resin layer includes convex portions having convex emission surfaces corresponding to each of the plurality of light-emitting elements, and a plurality of concave concave surfaces between the convex portions, and the light extraction layer includes a first emission portion consisting of a plurality of protrusions arranged on the first surface of the resin layer, and a second emission portion in which the first emission portions are arranged.

According to the present disclosure, the light extraction layer is disposed on one side of the substrate, the first reflective layer, and the second reflective layer. The first surface of the resin layer may be an outer surface between the first reflective layer and the second reflective layer, and the vertical height of the first emission portion may be greater than the thickness of the resin layer. The resin layer may include a recess portion recessed in a second surface direction corresponding to the first surface of the resin layer, and the resin layer may include a third surface and a fourth surface corresponding to each other on both sides of the first surface and the second surface, and the light extraction layer is disposed on the concave surface. The light extraction layer may be disposed on the third surface of the resin layer.
The first light extracting portion extends to the first surface and the fourth surface. The maximum width of the first light extracting portion is smaller than its vertical height, and the side cross-sectional shape of the first light extracting portion may be hemispherical or triangular. The light extraction layer may be made of any one of PTN, PET, and PEN. The light emitting surface of the resin layer overlaps each of the plurality of light emitting elements in a first direction, the concave surface does not overlap each of the plurality of light emitting elements in the first direction, and a plurality of first light emitting portions are arranged to overlap each of the plurality of light emitting elements. The inner surface of the light extraction layer is bonded along the first surface of the resin layer. A portion of each of the plurality of light emitting elements is arranged within an imaginary circle passing through each of the plurality of convex portions.

According to the present disclosure, it is possible to improve the luminance of light emitted in a line shape having a small height and a long length in a lighting device. According to the present disclosure, it is possible to provide a line-shaped surface light source between multiple reflective layers in a lighting device. By forming a resin layer covering the light-emitting element between the multiple reflective layers, it is possible to simplify the manufacturing process of the lighting module, reduce light loss, and improve light efficiency. According to the present disclosure, a thin lighting module is provided in the form of a line light source, thereby increasing design freedom. It is possible to improve the uniformity of light from the surface light source emitted between the multiple reflective layers. It is possible to improve the optical reliability of the lighting module according to the present disclosure and a lighting device including the same.

The reliability of a vehicle lighting device having an illumination module according to the present disclosure is improved, and the module can be applied to light units, various display devices, surface light source lighting devices, or vehicle lamps.

FIG. 1 is a perspective view illustrating a lighting device according to the present disclosure. FIG. 2 is a plan view of the lighting device of FIG. FIG. 3 is a diagram showing a detailed structure of a light extraction layer provided on the first surface of the lighting device of FIG. FIG. 4 is a front view of the lighting device of FIG. 1 . FIG. 5 is a cross-sectional side view of the lighting device of FIG. 2 taken along the line BB. 6 is a cross-sectional side view of the lighting device of FIG. 2 taken along the line CC. FIG. 7 is a diagram showing a detailed structure of a light extraction layer provided on the first surface of the resin layer in the lighting device of FIG. FIG. 8 is a diagram showing another example of the light extraction layer disclosed in FIGS. FIG. 9 shows another example of the lighting device of FIG. FIG. 10 is a diagram illustrating an example of light extraction in a lighting device according to the present disclosure. FIG. 11 shows a modified example of the lighting device according to the present disclosure. FIG. 12 is an example of a flexible lighting device according to the present disclosure. FIG. 13 is an example of a flexible lighting device according to the present disclosure. FIG. 14 shows an example of a lamp to which the lighting device according to the present disclosure is applied.

Hereinafter, preferred embodiments that will enable those skilled in the art to easily implement the present disclosure will be described in detail with reference to the accompanying drawings. However, it should be understood that the embodiments described herein and the configurations illustrated in the drawings are merely preferred embodiments of the present disclosure, and that various equivalents and modifications may exist at the time of filing this application. In describing the operating principles of the preferred embodiments of the present disclosure in detail, if a detailed description of related well-known functions or configurations is deemed to unnecessarily obscure the gist of the present disclosure, such detailed description will be omitted. The terms used below are defined in consideration of the functions in the present disclosure, and the meaning of each term should be interpreted based on the overall content of this specification. The same reference numerals are used throughout the drawings to refer to parts with similar functions and actions. The lighting device according to the present disclosure can be applied to various lamp devices requiring illumination, such as vehicle lamps, household lighting devices, and industrial lighting devices. For example, when applied to vehicle lamps, it can be used for headlamps, sidelights, side mirror lights, fog lamps, taillights, etc.
mp), brake lights, auxiliary brake lights, turn signals, position lamps, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, backup lamps, room lamps, dashboard lighting, etc. The lighting device of the present disclosure can also be applied to indoor and outdoor advertising devices, display devices, and various electric vehicle fields, and can also be applied to all lighting-related fields and advertising-related fields that are currently developed and commercialized or that can be realized through future technological developments.

Hereinafter, the embodiments will become clearer from the accompanying drawings and the description of the embodiments. In the description of the embodiments, when it is stated that each layer, region, pattern or structure is formed "on" or "under" the substrate, each layer, region, pad or pattern, it is also referred to as "on" or "under."
The terms "on" and "under" include those formed "directly" or "indirectly through another layer." References to the top and bottom of each layer are made with reference to the drawings.

<Lighting equipment>
FIG. 1 is a perspective view showing a lighting device according to the present disclosure, FIG. 2 is a plan view of the lighting device of FIG. 1, FIG. 3 is a view showing a detailed structure of a light extraction layer provided on a first surface of the lighting device of FIG. 2, FIG. 4 is an example of a front view of the lighting device of FIG. 1, and FIG. 5 is a view of the lighting device of FIG. 2 taken along line B-B.
6 is a side cross-sectional view of the lighting device of FIG. 2 taken along the line CC; FIG. 7 is a diagram showing the detailed structure of a light extraction layer provided on the first surface of the resin layer in the lighting device of FIG. 2;

1 to 7 , a lighting device 200 according to the present disclosure includes a light source having a plurality of light emitting elements 105, and irradiates light emitted from the light emitting elements 105 as a line-shaped surface light source. The light emitted from the light emitting elements 105 has a certain vertical height and is emitted as light having a long length. The lighting device 200 may include a substrate 210, a light source having light emitting elements 105 disposed on the substrate 210, a resin layer 220 disposed on the substrate 210 and the light emitting elements 105, and a second reflective layer 240 disposed on the resin layer 220. The lighting device 200 may include a first reflective layer 230 between the substrate 210 and the resin layer 220.

A plurality of the light emitting elements 105 are arranged in the second direction X. The light emitting elements 105 are arranged in one row. The plurality of light emitting elements 105 are arranged on a straight line or a curve extending in the second direction X. As another example, the light emitting elements 105 may be arranged in two or more rows in different columns. The interval G1 between adjacent light emitting elements 105 may be the same. The interval G1 may be greater than the thickness of the lighting device 200, for example, the vertical distance (e.g., Z1) from the lower surface of the substrate 210 to the upper surface of the second reflective layer 240. For example, when the vertical distance is Z1, the interval G1 may be three times or more than Z1. The interval G1 may be 10 mm or less.
If the distance G1 is greater than the above range, the luminous intensity may decrease, and if the distance G1 is smaller than the above range, the light emitting element 105
The number of

2, 6 and 10, the lighting device 200 has a maximum length X1 in the second direction X.
The length in the first and second directions Y and X may be greater than the thickness Z1 or height in the vertical direction Z. The maximum length X1 in the second direction may vary depending on the number of light emitting elements 105, and may be, for example, 30 mm or more. The maximum length Y1 in the first direction may be 13 mm or more, for example, 13 mm to 25 mm.
The maximum length Y1 of the lighting device 200 in the first direction Y may be in the range of a region where light emitted from the light emitting element 105 is diffused, a region where the rear of the light emitting element 105 is protected, and
and pattern area. With respect to the maximum length Y1 in the first direction Y, the length of the third surface (e.g., S3) and the length of the fourth surface (e.g., S4) of the lighting device may be the same or different from each other. For example, the length of the fourth surface S4 in the first direction may be shorter than the length of the third surface S3. The lighting device 200 may be a flexible module or a rigid module. The lighting device 200 may be flat or bendable in at least one of the first direction and the second directions Y and X. The lighting device 20
The light emitting element 105 may include two side surfaces corresponding to each other in a first direction Y and two side surfaces corresponding to each other in a second direction X. The light emitting element 105 may be disposed between layers of reflective material that are vertically opposed to each other, or may be disposed adjacent to one of the layers in a region between the layers of reflective material that are vertically opposed to each other. The light emitting element 105 may be disposed between a supporting member and a reflective member or layer that are vertically opposed to each other. The light emitting element 105 may emit light in at least one direction or in multiple directions. In the lighting device 200, each side surface may have the same thickness or the same height. The light emitting element 105 may be disposed between a supporting member and a reflective member or layer that are vertically opposed to each other.
05 is sealed by a layer of transparent resin material, which may be placed between layers of reflective material or between a supporting member and a reflective layer or member.

1, 5 and 6, the lighting device 200 may include a substrate 210, a light emitting device 105 on the substrate 210, a resin layer 220 on the substrate 210 and the light emitting device 105, and a second reflective layer 240 on the resin layer 220. The lighting device 200 may include a first reflective layer 230 between the substrate 210 and the resin layer 220. The resin layer 220 is disposed on the light emitting device 105. The resin layer 220 may be disposed on the light emitting device 105.
105, between adjacent light emitting elements 105, or on top of each light emitting element 105.

The substrate 210 includes a printed circuit board (PCB), and may include, for example, a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 board. The substrate 210 may be made of a flexible or rigid material. A circuit pattern is disposed on the upper portion of the substrate 210. The circuit pattern of the substrate 210 may include a plurality of pads in an area corresponding to the light emitting element 105. The circuit pattern of the substrate 210 may be disposed on the upper portion or on both the upper and lower portions. The resin layer 220 is disposed on the substrate 210.
The resin layer 220 is disposed between the substrate 210 and the second reflective layer 240. The resin layer 220 is disposed between the upper surface of the substrate 210 and the lower surface of the second reflective layer 240. The resin layer 220 is disposed between the upper surface of the substrate 210 and the lower surface of the second reflective layer 240. The resin layer 220 is disposed between the plurality of light emitting elements 105 disposed on the substrate 210.
The resin layer 220 may be a light-transmitting layer. The resin layer 220 may be made of glass. The plurality of light-emitting elements 105 (101, 102, 103) may be arranged in a first row or a first line.
≧2). Each outer surface of the lighting device 200 may be a side surface of the resin layer 220 having the largest thickness in the lighting device 200. The outer surfaces S1, S2, S3, and S4 of the resin layer 220 are connected to the substrate 210, the first reflective layer 230, and the second reflective layer 240.
The outer surfaces S1, S2, S3, and S4 of the resin layer 220 are arranged in the same plane as the respective sides of the substrate 210, the first reflective layer 230, and the second reflective layer 240. The resin layer 220 has a first surface S1 and a second surface S2 that correspond to each other in the first direction Y.
2. The second surface S3 and the fourth surface S4 may be provided so as to correspond to each other in the second direction X.
The first and second surfaces S1 and S2 extend from both ends of the third and fourth surfaces S3 and S4 in the second direction X. The first surface S1 faces the second surface S2 and may include a curved surface.
The length of the first surface S1 and the second surface S2 in the second direction X may be greater than the height or thickness in the vertical direction. The maximum lengths of the first surface S1 and the second surface S2 in the second direction X may be the same or different. The height or thickness in the vertical direction of the first surface S1 and the second surface S2 may be the same. The height or thickness in the vertical direction of the third surface S3 and the fourth surface S4 may be the same as the height or thickness in the vertical direction of the first surface S1 and the second surface S2. The first surface S1 and the second surface S2 in the resin layer 220 are
The first surface S1 may be a side surface having a long length in the direction X. The third surface S3 and the fourth surface S4 may be a side surface having a long length in the first direction Y. The first surface S1 may be a side surface having a long length in the direction X.
The second surface S2 may correspond to the light emitting portion 111 of the light emitting element 105 or may be a surface exposed in the second direction X from a first end of the third surface S3 and the fourth surface S4. The second surface S2 may face rear surfaces of the light emitting elements 105 or may be a surface exposed in the second direction X from a second end of the third surface S3 and the fourth surface S4. The third surface S3 and the fourth surface S4 may be a side surface different from the first surface S1 and the second surface S2. The rear surfaces of the light emitting elements 105 may be a surface opposite to the light emitting portion 111.

The light emitting portion 111 of each of the light emitting elements 105 may correspond to the first surface S1. Light emitted from the light emitting element 105 is emitted through the first surface S1, and a portion of the light is emitted through at least one of the second surface S2, the third surface S3, and the fourth surface S4. That is, most of the light emitted from the light emitting element 105 is emitted through the first surface S1. In the lighting device 200, the maximum lengths Y1 and X1 in the first and second directions may be the maximum lengths of the resin layer 220 in the first and second directions. As a result, a line-shaped light source is emitted through the first surface S1 of the resin layer 220.

The first surface S1 of the resin layer 220 may be an emission surface through which light emitted from the light emitting element 105 exits. The first surface S1 may be a front surface or an emission surface, and the second surface S2 may be a rear surface or a non-emission surface. The first surface S1 is a surface through which light exits, and its vertical surface extends along the second direction X. As another example, the first surface S1 may be a curved surface that bulges outward from the vertical direction, or may have an inclined structure that protrudes from the upper end to the lower end, or may have an inclined structure that protrudes from the lower end to the upper end. The first surface S1 may be
The first surface S1 may be a side surface on which a regular uneven shape or uneven structure is arranged. The first surface S1 may be a region having a larger surface area than the surface area of the opposite second surface S2. The first surface S1 may be
The resin layer 22 may include a plurality of light emitting surfaces S11 corresponding to the light emitting elements 101, 102, and 103, and a plurality of concave surfaces S13 respectively disposed between the plurality of light emitting surfaces S11.
The resin layer 220 may include a plurality of protrusions P1, P2, and P3 protruding from the first surface S1 and having an exit surface S11. The protrusions P1, P2, and P3 are arranged such that the exit surface S11 or a convex surface is convex toward the first surface S1.
A concave surface S13 is disposed in the region between P2 and P3. The concave surface S13 is a concave surface or
The resin layer 220 or the lighting device 200 may have a flat surface.
, P2, P3, recessed portions C1, C2 recessed toward the second surface S2. The recessed portions C1, C2 may overlap the concave surface S13 in the second direction X. The recessed portions C1, C2 may be disposed between the convex portions P1, P2, P3, respectively. The recessed portions C1, C2 may be spaced apart from the third and fourth surfaces S3, S4. The exit surface S11 and the concave surface S13 are alternately disposed. The convex portions P1, P2, P3 and the recessed portions C1, C2 are alternately disposed. The surface of the first surface S1 disposed at the outermost edge in the first direction may be the exit surface S11. The exit surface S11 at the outermost edge may be disposed between the third surface S3.
The light emitting surfaces S11 are respectively disposed at positions corresponding to the centers of the light emitting elements 101, 102, and 103. The light emitting elements 101, 102, and 103 may overlap with the convex portions P1, P2, and P3 in the first direction Y.
The concave surface S13 and the concave surface S14 overlap in the first direction Y.
The plurality of light emitting elements 101, 102, and 103 may not overlap the recessed portions C1 and C2 in the first direction Y. The vertical height of the light emitting surface S11 may be the same as the vertical thickness of the resin layer 220. The vertical height of the concave surface S13 may be the same as the vertical thickness of the resin layer 220.

The resin layer 220 may cover or mold the light emitting devices 101, 102, and 103. Each of the light emitting devices 101, 102, and 103 may include a light emitting chip. The light emitting devices 101, 102, and 103 may include a reflective sidewall, for example, a main body, surrounding the outside of the light emitting chip. The reflective sidewall is provided in a structure that surrounds the light emitting chip, with an area facing the first surface S1 of the resin layer 220 being open. The reflective sidewall may be a part of the light emitting devices 101, 102, and 103, or may be provided as a separate reflective material. The side surfaces of the light emitting devices 101, 102, and 103, excluding the light emitting portion 111, may be made of a reflective material or a transparent or opaque material.

Each of the light emitting devices 101, 102, and 103 has a bonding portion disposed at the bottom thereof and is electrically connected to a pad of the substrate 210. The light emitting devices 101, 102, and 103 may be connected in series, in series-parallel, parallel-series, or in parallel by the circuit pattern of the substrate 210. As another example, the light emitting devices 101, 102, and 103 may be connected in various groups by the circuit pattern of the substrate 210.
The light emitting chips 01, 102, and 103 may include a package in which an LED chip is packaged. The light emitting chips may be configured to emit blue, red, green, ultraviolet (UV), or other light.
V) can emit light.
The light emitting elements 101, 102, and 103 may emit at least one of white, blue, red, and green light. The light emitting elements 101, 102, and 103 emit light laterally, and their bottoms are disposed on the substrate 210. The light emitting elements 101, 102, and 103 may be packaged in a side view type. As another example, the light emitting elements 101, 102, and 103 may be LEDs.
The LED chip may be a chip, and one side of the LED chip may be open and the other side may be provided with a reflective member.

As shown in FIG. 2 , the maximum distance D2 between the light emitting device 105 and the first surface S1 and the distance D3 between the light emitting device 105 and the second surface S2 may be different. The distance D3 between the light emitting device 105 and the second surface S2 may be 2 mm or more, for example, in the range of 2 mm to 20 mm. If the distance D3 between the light emitting device 105 and the second surface S2 is smaller than this range, moisture penetration or an area in which a circuit pattern can be formed becomes smaller. If the distance D3 between the light emitting device 105 and the second surface S2 is larger than this range, the size of the lighting device 200 becomes larger. The maximum distance D2 may be the maximum distance between the light emitting surface S11 and the light emitting device 105, or the linear distance between the light emitting device 105 and the apex of the protrusions P1, P2, and P3. The maximum distance D2 may be 5 mm or more, for example, in the range of 5 mm to 20 mm or 8 mm.
If the maximum distance D2 is smaller than this range, hot spots may occur, and if it is larger than this range, the module size becomes large. The distance D1 between the line connecting the concave surface S13 and each of the light emitting devices 101, 102, and 103 may be 5 mm or more, for example, in the range of 5 mm to 12 mm, and the distance D
If the distance D1 is smaller than the above range, the depth D4 of the recessed portions C1 and C2 may become large or the maximum distance D2 may become small, resulting in dark areas occurring in the recessed portions C1 and C2.
The angle θ1 varies depending on the light directivity angle of each of the light emitting elements 101, 102, and 103. That is, if the distance between the line connecting both ends of the convex portions P1, P2, and P3 and each of the light emitting elements 101, 102, and 103 is too close, light is condensed in the center region of the light emitting surface S11.
When light is irradiated onto the projection P1 in the first direction, the luminous intensity through the light exit surface S11 decreases.
, P2, P3, the maximum length W1 is the distance between the adjacent recessed portions C1, C2, and may be equal to or smaller than the interval G1 between the light emitting elements 105. If the maximum length W1 of the protrusions P1, P2, P3 is greater than the interval G1 between the light emitting elements 105,
, P3, two or more light emitting elements 105 are arranged in the region P1, P2, P3, and the luminous intensity increases, but it becomes difficult to control the light distribution.
If the spacing G1 between the convex portions P1, P2, and P3 is smaller than the spacing G1 between the convex portions P1, P2, and P3, the size of the convex portions P1, P2, and P3 is small, so that a uniform distribution of light can be provided, but the luminous intensity will decrease. The maximum length W1 of the convex portions P1, P2, and P3 may be 15 mm or more, for example, in the range of 15 mm to 20 mm. The maximum length W1 of the convex portions P1, P2, and P3 may be greater than the depth D4 of the recess portions C1 and C2. The ratio of the maximum length W1 of the convex portions P1, P2, and P3 to the depth D4 of the recess portions C1 and C2 may be in the range of 1:0.4 to 1:0.7.
If the depth of the recessed portions C1 and C2 is smaller than the above range, the dark area between the adjacent protrusions P1, P2, and P3 increases.
The recessed portion C extends to the region adjacent to the light emitting element 105, increasing the optical interference between the light emitting element 105.
The depth D4 of the recesses C1 and C2 may be a linear distance from a line connecting the vertices of the protrusions P1, P2, and P3 to the bottom of the recesses C1 and C2.

3 to 6, the resin layer 220 and the light emitting devices 105 are disposed on the substrate 210. The first reflective layer 230 is disposed between the resin layer 220 and the substrate 210. The resin layer 220 may contact the top and side surfaces of the light emitting devices 101, 102, and 103. The resin layer 220 may contact the top surface of the first reflective layer 230. A portion of the resin layer 220 may contact the substrate 210 through a hole in the first reflective layer 230.
The resin layer 220 can contact the light emitting elements 101, 102, and 103.
The first surface S1, the second surface S2, and the second surface S3 of the resin layer 220 can contact the light emitting portion 111 of the resin layer 220.
The third surface S3 and the fourth surface S4 are outer surfaces between the first and second reflective layers 230 and 240. The upper surface of the resin layer 220 may contact the second reflective layer 240, and the lower surface thereof may contact the second reflective layer 240.
The resin layer 220 may contact the first reflective layer 230. The upper and lower surfaces of the resin layer 220 may be horizontal planes or curved surfaces.
The bottom surface of the resin layer 220 may be in contact with the substrate 210. The bottom area of the resin layer 220 may be the same as the top area of the substrate 210. The bottom area of the resin layer 220 may be the same as the top area of the first reflective layer 230. The top area of the resin layer 220 may be the same as the top area of the second reflective layer 240. The length of the resin layer 220 in the second direction X may be the same as the length (e.g., X1) of the substrate 210. The maximum length of the resin layer 220 in the second direction X may be the same as the maximum length of the first reflective layer 230 or the second reflective layer 240. The maximum length (e.g., Y1) of the resin layer 220 in the first direction Y may be the same as the maximum length of the substrate 210. The maximum length (e.g., Y1) of the resin layer 220 in the first direction Y may be the same as the maximum length of the first reflective layer 230. The maximum length (e.g., Y1) of the resin layer 220 in the first direction Y may be the same as the maximum length of the second reflective layer 240. The minimum length of the resin layer 220 in the first direction Y may be the same as the minimum length of the substrate 210. The minimum length of the resin layer 220 in the first direction Y may be the same as the minimum length of the first reflective layer 230 or the second reflective layer 240. The maximum length Y1 in the first direction Y may be the length between the apex (or high point) of the convex portions P1, P2, P3 of the lighting device and the second surface S2, and the minimum length may be the length between the bottom point of the concave surface S13 of the lighting device and the second surface S2. The resin layer 220 is disposed between the first and second reflective layers 230 and 240. The first and second reflective layers 230 and 240 have the same area, and the resin layer 220
Therefore, the resin layer 220 can face the upper and lower surfaces of the light emitting device 1.
The light emitted from the first reflecting layer 05 and the light reflected by the first reflecting layer 230 and the second reflecting layer 240 can be diffused and guided toward the first surface S1 to be emitted.

5, the resin layer 220 may be formed to a thickness Zb that is thicker than the thickness of the light emitting device 105. Here, the thickness of the light emitting device 105 may be a vertical length of the light emitting device 105 that is smaller than the length in the first direction Y. The thickness of the light emitting device 105 may be 3 mm or less.
The thickness of the light emitting element 105 may be, for example, 1 mm to 2 mm.
, for example, from 1.2 mm to 1.8 mm.
A part of the resin layer 220 is formed on the light emitting elements 101, 102, and 103 and the second reflective layer 2.
40. As a result, the resin layer 220 is disposed between the light emitting elements 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121
The light emitting element 105 can protect the upper portions of the light emitting elements 102 and 103 and prevent moisture from penetrating.
The light emitting device 101, 102, and 103 can be protected by the substrate 210 disposed on the bottom and the resin layer 220 disposed on the top. Therefore, the distance between the top surface of the resin layer 220 and the top surface of each of the light emitting devices 101, 102, and 103 is 0.6 mm or less, for example, 0.
The resin layer 220 may be disposed at a thickness ranging from 5 mm to 0.6 mm. The upper portion of the resin layer 220 may extend to the upper portion of each light emitting element 101, 102, and 103 to protect the upper portion of the light emitting elements 101, 102, and 103. As shown in FIGS. 2 and 3, the convex surface or the light emitting surface S11 of the convex portions P1, P2, and P3 may have a first curvature. The concave surface S13 may be flat or
The convex portions P1, P2, and P3 may have a curvature greater than the first curvature.
The radius of curvature is 7.5 mm or more, for example, in the range of 7.5 mm to 14 mm or 8 mm to 11 mm.
If the curvature radius of each of the convex portions P1, P2, and P3 is smaller than the above range, the improvement in luminous intensity is small, and if it is larger than the above range, dark areas may occur. If the concave surface S13 has a curvature, the curvature radius of the concave surface S13 may be in the range of 1/2 m.
, P2, P3. The ratio of the radius of curvature of the concave surface S13 to the radius of curvature of the convex portions P1, P2, P3 may be in the range of 1:8 to 1:28. If the radius of curvature of the concave surface S13 is smaller than this range, the amount of light emitted through the concave surface S13 decreases and dark areas increase. If the radius of curvature of the convex portions P1, P2, P3 is larger than this range, the amount of light emitted through the concave surface S13 decreases and dark areas increase.
Therefore, the depth D4 and the radius of curvature of the concave surface S13 are determined by taking into consideration the position of the light emitting element 105 and the directivity angle of the light emitting element 105.
The concave surface S13 may have a radius of curvature ranging from 0.5 to 1 mm. The concave surface S13 may have a curved shape with a predetermined curvature, thereby refracting and transmitting incident light and reducing the occurrence of dark areas in the recessed portions C1 and C2.

5, the thickness Zb of the resin layer 220 may be the distance between the upper and lower surfaces of the resin layer 220. The thickness Zb of the resin layer 220 may be the vertical distance between the first and second reflective layers 230 and 240. The thickness Zb may be the same as the distance between the first and second reflective layers 230 and 240. The thickness Zb may be the distance between the first surface S1 and the second reflective layer 230.
For example, the distance between the first surface S1 and the second surface S2 may be smaller than the distance between the first surface S1 and the second surface S2.
The distance between the first direction Y and the surface S2 may include a maximum length Y1 and a minimum length Y2.
The maximum length Y1 may be the linear distance between the apex of the convex portion P1 and the second surface S2.
The distance or spacing between the third and fourth surfaces S3 and S4 of the resin layer 220 is
and the second surface S2.
The distance or spacing between the first reflective layer 230 and the second reflective layer 240 may be the linear distance between the first surface S1 and the second surface S2 of the resin layer 220.
The distance Zb between the first and second reflective layers 230 and 240 may be smaller than the distance or gap between the first and second reflective layers 230 and 240 and the surface S2. By arranging the distance between the first and second reflective layers 230 and 240 to be smaller than the length or minimum width of the lighting device 200 in the first direction Y, a line-shaped surface light source can be provided in the first direction Y, improving luminous intensity and preventing hot spots. In addition, the lighting device may be provided with a certain thickness and flexibility that allows it to be uneven in the third direction Z. The thickness Zb of the resin layer 220 is
The thickness Zb of the resin layer 220 may be equal to or less than twice the thickness of the light emitting device 105, for example, between one and two times the thickness of the light emitting device 105. The thickness Zb of the resin layer 220 may be equal to or less than 2 mm, for example, in the range of 1.5 mm to 1.9 mm or 1.6 mm to 1.8 mm. The thickness Zb of the resin layer 220 may be equal to or less than 0.8 times the thickness Z1 of the lighting device 200, for example, in the range of 0.4 to 0.8 times the thickness Z1 of the lighting device 200. Since the resin layer 220 is disposed with a difference of 1.2 mm or less from the thickness Z1 of the lighting device 200, a decrease in light efficiency of the lighting device 200 can be prevented and flexibility characteristics can be enhanced. The thickness Zb of the resin layer 220 is equal to or less than the thickness Zb of each of the light emitting devices 101, 10
The thickness Zb of the resin layer 220 may be smaller than the length or maximum length of the light emitting surface S11 in the second direction X. That is,
The resin layer 220 has a slim thickness Zb, and can provide a linear surface light source through the first surface S1 in one direction. The resin layer 220 can include a resin material such as silicone, silicone molding compound (SMC), epoxy, or epoxy molding compound (EMC). The resin layer 220 can include a UV (ultraviolet) curable resin or a thermosetting resin material, such as PC, OPS, PMMA, or PVC. For example, the resin layer 220 can be mainly made of a resin material containing urethane acrylate oligomer as its main raw material. For example, a mixture of urethane acrylate oligomer, which is a synthetic oligomer, and a polymer type such as polyacrylic can be used. Of course, IBOA (isobornyl acrylate), which is a low-boiling point dilutable reactive monomer, can be used here.
It may further contain a monomer mixture of 1-hydroxycyclohexyl acrylate (HPA), 2-hydroxypropyl acrylate (HPA), 2-hydroxyethyl acrylate (2-HEA), etc., and a photoinitiator (e.g., 1-hydroxycyclohexyl acrylate) may be used as an additive.
phenyl-ketone, etc.) or antioxidants, etc. may be mixed.

The resin layer 220 may include beads (not shown), which may diffuse and reflect incident light to increase the amount of light.
The protrusions P1, P2, and P3 of the resin layer 220 may include a phosphor. The phosphor may include at least one of a yellow, a green, a blue, and a red phosphor.
The region where P3 is formed may be provided as a lens portion. The lens portion of the resin layer 220 is provided in a lens shape having a convex surface, and may have a hemispherical shape, a semicircular shape, a semi-elliptical shape, or an aspherical shape when viewed from the top. The lens may be a collimator.
The lens unit may include a mator lens. The lens unit is spaced farther from the light emitting device 101 as the vertex thereof corresponds to the center of the light emitting device 105. The thickness of the lens unit in the third direction Z may be the thickness of the resin layer 220. The lens unit has flat upper and lower surfaces and is curved toward the first surface S1, so that it can diffuse light incident toward the first surface S1. The lens unit is disposed between the first and second reflective layers 230 and 240, which are flat at the top and bottom, and can refract and output light toward the first surface S1. The lens unit can refract light incident on a region off the optical axis with respect to the optical axis to an output angle greater than an incident angle. When the lighting device 200 has a flexible characteristic, the resin layer 220, the first and second reflective layers 230, and the second reflective layers 240 may be arranged in a curved shape.
40 may include an uneven curved region. Each of the light emitting surfaces S11 of the resin layer 220 may emit light emitted from each of the light emitting elements 101, 102, and 103. The recessed portions C1 and C2 disposed between the protruding portions P1, P2, and P3 of the resin layer 220 are recessed toward the second surface S2.
The recessed portions C1 and C2 of the resin layer 220 are formed on the concave surface S13 of the resin layer 220. Light emitted from the light emitting elements 101, 102, and 103 is emitted from the regions between the protruding portions P1, P2, and P3 through the recessed portions C1 and C2.
The generation of dark areas in the resin layer 220 can be reduced.
When the protrusions P1, P2, P3 and the recesses C1, C2 are arranged, the substrate 210 and the first and second reflective layers 230, 240 are arranged such that one side of the substrate 210 is provided with the protrusions P1, P2, P3 and the recesses C1, C2.
The number of the convex portions P1, P2, and P3 or the lens portions of the resin layer 220 may be the same as the number of the light emitting devices 101, 102, and 103.

5 and 6, the first reflective layer 230 can reflect light emitted from the light emitting element 105. The first reflective layer 230 may be formed as an upper layer of the substrate 210 or as a separate layer.
10 with an adhesive. The resin layer 220 is attached to the upper surface of the first reflective layer 230. The first reflective layer 230 has a plurality of holes 232 in an area corresponding to the lower surface of the light emitting element 105, and the light emitting element 105 is connected to the substrate 210 through the holes 232. A portion of the resin layer 220 may contact the substrate 210 through the holes 232. The holes 232 may be areas where the light emitting element 105 is bonded to the substrate 210. The first reflective layer 230 may have a single-layer or multi-layer structure. The first reflective layer 230 may include a light-reflecting material, for example, a metal or a non-metal material. When the first reflective layer 230 is made of metal, it may be stainless steel, aluminum (Al), silver, or the like.
The first reflective layer 230 may include a metal layer such as Ag, and in the case of a non-metallic material, it may include a white resin material or a plastic material.
The first reflective layer 230 may include at least one of a low-reflection film, a high-reflection film, a diffuse reflection film, and a specular reflection film. The first reflective layer 230 may be provided as, for example, a specular reflection film that reflects incident light to the first surface S1.

4, the thickness Zc of the first reflective layer 230 may be smaller than the thickness Za of the substrate 210. The thickness Zc of the first reflective layer 230 may be 0.5 times the thickness Za of the substrate 210.
The first and second optical fibers are arranged at a ratio of 1:1 or more and 1:1 or less, so that the transmission loss of incident light can be reduced.
The thickness Zc of the reflective layer 230 may be in the range of 0.2 mm to 0.4 mm. If the thickness Zc is smaller than this range, a light transmission loss occurs. If the thickness Zc is larger than this range, the thickness Zc of the illuminating device 200 may be reduced.
The second reflective layer 240 is disposed on the entire upper surface of the resin layer 220,
The second reflective layer 240 may be made of the same material as the first reflective layer 230. The second reflective layer 240 may be made of a material with higher light reflectivity or may have a greater thickness than the material of the first reflective layer 230 in order to reflect light and reduce light transmission loss. The second reflective layer 240 may have the same thickness as or a greater thickness than the thickness Zc of the first reflective layer 230. For example, the first reflective layer and the second reflective layer 230, 240 may be made of the same material and have the same thickness. The thickness Zd of the second reflective layer 240 may be the same as or smaller than the thickness Za of the substrate 210. The thickness Zd of the second reflective layer 240 is disposed to be 0.5 times or more, for example, in the range of 0.5 to 1 times, the thickness Za of the substrate 210, to reduce transmission loss of incident light. The thickness Zd of the second reflective layer 240 is 0.2
If the thickness is smaller than this range, a light transmission loss occurs, and if the thickness is larger than this range, the thickness Z1 of the lighting device 200 increases.
The second reflective layer 240 may have a single layer or a multi-layer structure. The second reflective layer 240 may include a material that reflects light, such as a metal or a non-metal material. When the second reflective layer 240 is a metal, it may include a metal layer such as stainless steel, aluminum (Al), or silver (Ag).
In the case of the non-metallic material, it may include a white resin material or a plastic material.
The reflective layer 240 may include a white resin material or a polyester (PET) material.
The reflective layer 240 may include at least one of a low-reflection film, a high-reflection film, a diffuse reflection film, or a regular reflection film. The second reflective layer 240 may be provided as a regular reflection film so that incident light travels toward the first surface S1. The first and second reflective layers 230 and 240 may be made of the same or different materials.
10, the stacked structure of the first reflective layer 230, the resin layer 220, and the second reflective layer 240 may include the convex portions P1, P2, and P3 and the recessed portions C1 and C2 in one direction. The convex portions P1, P2, and P3 may have flat upper and lower surfaces and may have a curved or hemispherical shape in the first direction Y. The recessed portions C1 and C2 may have a flat or concave curved surface in the direction of the second surface S2. The light emitting surface S11 and the concave surface S2 in the resin layer 220 may have a curved or hemispherical shape in the first direction Y.
At least one or both of the resin layers 220 may be treated to have a haze surface to diffuse light. The haze surface may be treated to have a rougher surface than the inner surface of the resin layer 220, to diffuse the emitted light.

The lighting device 200 according to the present disclosure may have a line-shaped thickness Z1 in the third direction Z, thereby providing a flexible, line-shaped surface light source. The thickness Z1 of the lighting device 200 may be 3 mm or less, for example, 3 mm or less, or may be in a range of 2.4 mm to 3 mm. That is, the lighting device 200 may be provided as a line-shaped surface light source having a thickness of 3 mm or less. As another example, the lighting device 200 may be disposed in a range of 2 mm to 6 mm. In this case, although the thickness of the lighting device 200 increases, the resin layer 220 may be thicker, thereby increasing the line width and increasing the light distribution area.

1 to 3, the lighting device 200 according to the present disclosure may include a light extraction layer 260 disposed on the first surface S1. The light extraction layer 260 is disposed on the first surface S1 of the resin layer 220. The light extraction layer 260 extends from a side surface of the substrate 210 to a side surface of the second reflective layer 240 on the first surface S1. As another example, as shown in FIG. 9, the light extraction layer 260 extends from a side surface of the first reflective layer 230 to a side surface of the second reflective layer 240 on the first surface S1. The vertical height of the light extraction layer 260 is 1/2 the height from the bottom surface of the substrate 210 to the bottom surface of the second reflective layer 240.
or a height (for example, Z1) from the bottom surface of the first reflective layer 230 to the top surface of the second reflective layer 2
The light extraction layer 260 may be formed on the first surface of the resin layer 220.
The light extraction layer 260 may be attached or bonded to the side surface S1 of the substrate 210.
The light extraction layer 260 may be attached or bonded to at least one of the sides of the first and second reflective layers 230 and 240. An adhesive layer (not shown) is disposed between the inner surface of the light extraction layer 260 and the first surface S1. The adhesive layer may include a transparent resin material such as silicone or epoxy. The light extraction layer 260 may be a light-transmitting member, such as a diffusion layer or an optical layer.
The material of the light extraction layer 260 may include synthetic resin or photo-curable resin, such as polyesters, epoxy resins, (meth)acrylate resins such as polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, and mixtures thereof. In addition, the material of the light extraction layer 260 may include, for example, PET (polyethylene
terephtalate), PTT (polytrimethyleneterephtalate), PBT (polybutyleneterephtalate)
, PEN (polyethylene naphthalate), PTN (polytrimethylene naphthalate), PBN (polybuty
lene naphthalate), PCT (polycyclohexadimethylene terephtalate), PCN (polycyclohexa
dimethylene naphthalate), PCC(polycyclohexadimethylene cyclohexadimethylcar
Among these, PET, PEN, PCT, and PCN are preferred.
In particular, any one of PTN, PET, and PEN may be used. The refractive index of the material of the light extraction layer 260 may be 1.5 or less, for example, in the range of 1.41 to 1.59, to prevent a decrease in brightness. The light extraction layer 260 is disposed along the first surface S1 of the resin layer 220, thereby improving the brightness of light emitted through the exit surface S11 of the first surface S1. The light extraction layer 260 has a concave-convex pattern or a prism pattern on its outer surface, which diffuses incident light and improves the uniformity of light. The light extraction layer 26
0 is disposed along the light exit surface S11 and the concave surface S13 of the resin layer 220.

The light extraction layer 260 includes a first extraction portion F1 and a second extraction portion F2 arranged in one direction, the first extraction portion F1 including a plurality of protrusions, and the second extraction portion F2 including a plurality of grooves respectively arranged between the protrusions. The first extraction portion F1 is disposed in the light extraction layer 260.
The second extraction portion F2 may protrude from the body or base of the light extraction layer 2.
60 may be the outer surface. Grooves may be arranged between the plurality of protrusions. The protrusions and grooves may be alternately arranged, and the spacing between the protrusions may be constant. For example, the spacing between the protrusions on the light-extracting surface may be constant. The inner surface of the light-extracting layer 260 may include a first region having a convex curvature along the light-extracting surface S11 and a second region having a concave or flat surface along the concave surface S13. The first region may be a surface corresponding to the outer surface of the light-extracting surface S11 or the convex portions P1, P2, and P3, and the second region may be a surface corresponding to the concave surface S13. The first extraction portion F1 may have a hemispherical side cross-sectional shape. The outer surface of the first extraction portion F1 may be a convex curved surface. As another example, the first extraction portion F1 may have a triangular shape as shown in FIG. 8. The second extraction portion F2 may be an outer surface connecting the protrusions. The surface of the second extraction portion F2 may include a curved surface.

As shown in FIG. 1, the height of the first extraction portion F1, i.e., the length in the third direction Z, is
20 (e.g., Zb), and extends from the side of the substrate 210 to the side of the second reflective layer 240. The height of the first extraction portion F1 in the third direction Z may be the same as the height of the light extraction layer 260. As shown in FIGS. 3 and 5, the maximum width B1 of the first extraction portion F1 may be greater than the thickness B3 of the first extraction portion F1.
The width of the bottom end of the protrusion may be 50 μm or more, for example, in the range of 50 to 150 μm. The thickness B3 of the first extracted portion F1 may be the maximum thickness of the protrusion, i.e., the maximum length of the protrusion protruding in the first direction Y. The maximum thickness B3 of the first extracted portion F1 may be 20 μm or more, for example, in the range of 20 to 50 μm. The maximum width B1 of the first extracted portion F1
The width B2 of the second extracted portion F2 may be equal to or smaller than the thickness B3 of the first extracted portion F1, and may be 15 μm or larger, for example, 15 to 30 μm. The maximum width of the first extracted portion F1 may be smaller than the vertical height.

If the maximum width B1 of the first extraction portion F1 is smaller than the above range, the amount of incident light may decrease or the uniformity of light may decrease, and if it is larger than the above range, the adhesive strength with the curved surface of the light emitting surface S11 may decrease or the light loss may increase. The thickness B3 of the first extraction portion F1 may take into consideration light refraction and light guide efficiency, and if it is smaller than the above range, the diffusion efficiency may decrease, and if it is larger than the above range, the uniformity of light may decrease. The first extraction portion F1 has five or more convex protrusions arranged along the light emitting surface S11, and can diffuse the light incident through the light emitting surface S11. The protrusions of the first extraction portion F1 are arranged to extend from each of the light emitting elements 101, 10
2, 103 may correspond to two or more. This improves the uniformity of light emitted through the light extraction layer 260. At this time, dark areas that may occur on the recesses C1, C2 are improved by the light extraction layer 260. The maximum thickness of the light extraction layer 260 may be smaller than the maximum width B1 of the first extraction portion F1. Such a light extraction layer 260 may
Since the resin layer 220 is provided with a thickness that does not reduce flexibility, it adheres closely to the first surface S1 of the resin layer 220, i.e., the light-emitting surface S11, along the concave surface S13, preventing separation from the first surface S1. Here, the concave surface S13 is provided with the first extraction unit F1 or the second extraction unit F2.
2 is arranged, but is not limited to this.

As shown in FIG. 2, the first end Fa of the light extraction layer 260 is adhered to the third side surface S3.
The second end Fb is disposed on the fourth side surface S4. The first end Fa of the light extraction layer 260 may be located at a position overlapping the first light emitting element 101 located first in the second direction X. The second end Fb of the light extraction layer 260 may be located at a position overlapping the third light emitting element 103 located last in the second direction X. The first and second ends Fa and Fb of the light extraction layer 260 may be located at a position overlapping the third light emitting element 103 located last in the second direction X.
Since the light emitting element 105 overlaps the light emitting element 105 in the second direction X, loss of light emitted from the light emitting element 105 having a predetermined directivity angle distribution can be reduced. The first and second ends Fa and Fb of the light extraction layer 260 extend in the direction of the second side surface S2 from the line Xc passing through the light emitting element 105. This reduces light loss due to the light extraction layer 260 at the third and fourth side surfaces S3 and S4 of the resin layer 220. The first and second ends Fa and Fb of the light extraction layer 260 are closer to the light emitting element 105 than the imaginary line Xb connecting the plurality of concave surfaces S13.
Since the plurality of concave surfaces S13 are arranged adjacent to the imaginary straight line Xc connecting the plurality of light exiting portions 111 of the resin layer 220, the loss of light traveling toward the third and fourth side surfaces S3 and S4 of the resin layer 220 can be reduced. In the present disclosure, the imaginary straight line Xb extending from the plurality of concave surfaces S13 is arranged on a horizontal line or in the form of an inclined oblique line. The imaginary straight line Xa connecting the plurality of light exiting surfaces S11 is arranged on a horizontal line or in the form of an inclined oblique line. In this case, the distance (e.g., D4) between the two straight lines Xa and Xb may be the same or may decrease in the direction toward the fourth side surface.

1 and 7, the convex portions P1, P2, and P3 of the resin layer 220 or the light-emitting surface S
The shape of 11 can include a hemispherical shape, a semicircular shape, a semi-elliptical shape, or an aspherical shape.
Here, a part of the light emitting element 105 is arranged on an imaginary circle Q4 that passes through at least two of the points where the convex portions P1, P2, P3 or the light emitting surface S11 contact the concave surface S13 and the center point. A central axis Ya that passes through the center Pr of the imaginary circle Q4 and the center of the light emitting element 105
is perpendicular to the imaginary straight line Xc passing through the light emitting portion 111 of the light emitting element 105, or
0 degree. In this case, the central axes of the respective convex portions P1, P2, and P3 may be parallel to each other.
The angle W1 between the convex portions P1, P2, and P3 and the exit surface S11 may be in the range of 115 degrees to 135 degrees, for example, taking into consideration the light directivity angle. When the convex portions P1, P2, and P3 and the exit surface S11 are hemispherical, the distance Rr between the center Pr of the imaginary circle and the exit surface S11 may be in the range of 115 degrees to 135 degrees.

Here, as shown in FIGS. 7 and 11, the angle between Ya and Xc is
, P3 are arranged on the same target focal length, and light is irradiated to the light emitting elements 101, 101A, 101B and the central axis Yb thereof are shifted or tilted according to the target direction. As a result, in any of the convex portions P1, P2, P3, the angle between Ya and Xc is set to 90 degrees or more, and can be in the range of 90 degrees to 150 degrees, for example. That is, the central axes Ya, Ya1, Ya2 passing through the center of each of the light emitting elements 101, 102, 103 and the center of the virtual circle are extended to fit into one of the points (targets). That is, the central axes Ya, Ya1, Ya2 on the convex portions P1, P1a, P1b are shifted or tilted according to the target direction.
The two may not be parallel to each other.

In this case, a virtual line Xa passing through the adjacent convex portions P1, P1a, P1b or the light emitting surface S1 may be inclined at a predetermined angle Q5 from the horizontal line X0. The angle Q5 is 0.1
The angle may be 60 degrees or more, and may be variable depending on the number of light-emitting elements, and may be up to 60 degrees.

8 and 5, the first extraction portion F3 in the light extraction layer 260 may have a triangular side cross section. The outer surface of the first extraction portion F3 may have a prism pattern structure with an angular or curved apex. The second extraction portion F4 may include a curved surface as an outer surface connecting the protrusions. The height of the first extraction portion F3 in the third direction Z is determined by the thickness (Zb) of the resin layer 220.
5) and extends from the side of the substrate 210 to the side of the second reflective layer 240. The height of the first extraction portion F3 in the third direction Z may be the same as the height of the light extraction layer 260. The maximum width B1 of the first extraction portion F3 is equal to the maximum thickness B3 of the first extraction portion F3.
The maximum width B1 of the first extracted portion F3 may be equal to or smaller than the width of the bottom end of the protrusion, and may be 4 μm or more, for example, in the range of 4 to 15 μm.
The thickness B3 of the first extraction portion F3 may be the maximum thickness of the protrusion, and may be the maximum length of the protrusion protruding in the first direction. The thickness B3 of the first extraction portion F3 may be 4 μm or more, for example, in the range of 4 to 20 μm. The width B2 of the second extraction portion F4 may be equal to or smaller than the thickness B3 of the first extraction portion F3, and may be 4 μm or more, for example, in the range of 4 to 10 μm.
If the maximum width of the extraction portion F3 is smaller than the above range, the amount of incident light may decrease or the uniformity of light may decrease, and if it is larger than the above range, the adhesive strength with the curved surface of the exit surface S11 may decrease or the light loss may increase. The thickness B3 of the first extraction portion F3 takes into consideration the refraction of light due to the prism pattern shape and the light guide efficiency. If it is smaller than the above range, the diffusion efficiency may decrease, and if it is larger than the above range, the uniformity of light may decrease.
The maximum width of the first extraction unit F3 may be smaller than the vertical height. The first extraction unit F3 has five or more convex protrusions arranged along the light exit surface S11, and can diffuse light incident through the light exit surface S11. The protrusions of the first extraction unit F3 are arranged to extend from the light emitting elements 101, 102, 103, 104, 105, 106, 107, 108, 109, 110A, 110B, 111C, 111D, 111E, 111F, 111G, 111H, 111I, 111J, 111K ...
03 can correspond to two or more. This improves the uniformity of light emitted through the light extraction layer 260. At this time, dark areas that may occur on the recesses C1 and C2 are improved by the light extraction layer 260.

10, an angle R0 between the center of the light emitting device 105 and the bottom of the recess C0 may be 50 degrees or more, for example, in a range of 50 degrees to 80 degrees, based on a line passing through the center of the light emitting device 105 and the center of the protrusion P0. The recess C0 may be spaced apart at the angle R0 to refract light incident from the light emitting device 105 and emit it to the outside. The protrusion P0 and the recess C0 may include the protrusions P1, P2, and P3 and the recesses C1 and C2 disclosed in FIGS. 1 to 9.

As shown in Fig. 12, the lighting device according to the present disclosure may be curved convexly in a downward direction or toward the substrate as it approaches the center region based on the third and fourth surfaces S3 and S4, or conversely, may be curved convexly in an upward direction or toward the second reflective layer. As shown in Fig. 13, the lighting device according to the present disclosure may include a region that bulges upward from the third surface S3 toward the fourth surface S4 or toward the second reflective layer, and at least one recessed region that is recessed downward or toward the substrate between the bulging regions or in a region adjacent to the bulging region. The bulging regions and the recessed regions are alternately arranged.

The above-disclosed embodiments, modifications, or other examples may be selectively mixed with each other or substituted with the structure of other examples, and the above-disclosed embodiments may be selectively applied to each example. In addition, the second, third, and fourth surfaces S2, S3 of the resin layer 220, excluding the first surface, may be selectively applied to each example.
, S4 may be attached with a reflective layer or film made of a resin material, which can block light leakage from non-emitting areas.

The present disclosure provides a lighting device having a resin layer 220 with a thickness of 3 mm or less or thicker;
For example, when the resin layer 220 is provided with a thickness of 3 mm to 6 mm, the light-emitting area increases and the light distribution improves as the thickness of the resin layer 220 increases. The lighting device according to the present disclosure can be applied to a lamp as shown in Fig. 14. The lamp can be applied to a vehicle lamp such as a head lamp, a side lamp, a side mirror lamp, a fog lamp, a tail lamp, a brake lamp, a daytime running light, a vehicle interior lamp, a door scuff, a rear combination lamp, or a backup lamp.

14, the lamp may include a housing 503 having an inner lens 502 and a lighting device 200 having the first and second light emitting elements 101 and 103 disclosed above. The thickness of the lighting device 200 is 1/2 times the thickness of the housing 50
The width Z3 of the light emitting portion 515 of the inner lens 502 is small enough to be inserted into the inner width Z3 of the inner lens 502.
may be equal to or less than twice the thickness of the lighting device 200, thereby preventing a decrease in luminous intensity. The inner lens 502 may be spaced a predetermined distance, for example, 10 mm or more, from the front surface of the lighting device 200. An outer lens 501 is disposed on the light-emitting side of the inner lens 502. The lamp having such a lighting device 200 is an example, and other lamps may be applied with a flexible structure, for example, a curved surface or a curved structure when viewed from the side.

The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present disclosure and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present disclosure.

Claims (12)

A substrate;
a plurality of light-emitting elements disposed on the substrate;
a first reflective layer disposed on the substrate;
a resin layer disposed on the first reflective layer and including a first surface through which light emitted from the light emitting element is extracted;
a second reflective layer disposed on the resin layer; and
a light extraction layer disposed along the first surface of the resin layer;
the plurality of light emitting elements are in contact with the resin layer and electrically connected to the substrate;
the resin layer is disposed between the first reflective layer and the second reflective layer;
the first surface of the resin layer has a convex light-emitting surface corresponding to each of the plurality of light-emitting elements,
the resin layer includes a plurality of convex portions each having the convex light exit surface,
the plurality of convex portions are disposed between the first reflective layer and the second reflective layer,
the light extraction layer disposed on the outer side of the first surface of the resin layer includes a plurality of protrusions;
Each of the plurality of protrusions has a curved surface that is convex from the inside to the outside of the light extraction layer,
The number of the plurality of protrusions is greater than the number of the plurality of convex portions. The lighting device of claim 1, wherein the light extraction layer extends outside the substrate and the first and second reflective layers. the light extraction layer is bonded to the first surface of the resin layer with an adhesive ;
The lighting device of claim 1 , wherein the light extraction layer is further adhered to at least one of the first and second reflective layers. A lighting device described in any one of claims 1 to 3, wherein the vertical height of the light extraction layer is greater than the thickness of the resin layer. A lighting device described in any one of claims 1 to 4, wherein the vertical height of the multiple protrusions is greater than the thickness of the resin layer. the light extraction layer includes an inner surface disposed on the first surface of the resin layer and an outer surface having the plurality of protrusions;
The lighting device according to claim 1 , wherein the plurality of protrusions extend outside the first reflective layer and the second reflective layer . The plurality of light-emitting elements are arranged in a second direction,
each of the plurality of light-emitting elements overlaps with each of the plurality of protrusions in a first direction perpendicular to the second direction;
The lighting device according to claim 1 , wherein at least one of the plurality of protrusions arranged outside the light extraction layer overlaps with each of the plurality of light-emitting elements in the first direction. Each of the plurality of light-emitting elements includes an emission portion that emits light toward each of the plurality of convex portions.
8. The lighting device according to claim 1. the resin layer includes a second surface opposite to the first surface of the resin layer, and third and fourth surfaces disposed on both sides of the first and second surfaces,
the resin layer includes concave surfaces respectively disposed in regions between the plurality of convex portions ,
The lighting device according to claim 1 , wherein the light extraction layer is further disposed on the concave surface. The lighting device of claim 9, wherein the light extraction layer extends to a portion of the third surface adjacent to one side of the first surface of the resin layer. The lighting device described in claim 10, wherein the light extraction layer extends to a portion of the fourth surface adjacent to the other side of the first surface of the resin layer. The lighting device described in any one of claims 1 to 11, wherein the light extraction layer and the resin layer are made of different materials.